Date: Fri, 17 Oct 2003 17:00:41 -0400 From: Barney Wolff <barney@databus.com> To: Peter Wemm <peter@wemm.org> Cc: freebsd-current@freebsd.org Subject: Re: panic: pmap_enter: attempted pmap_enter on 4MB page Message-ID: <20031017210041.GA22128@pit.databus.com> In-Reply-To: <20031017165157.276E22A8D5@canning.wemm.org> References: <20031017103459.GA8418@stack.nl> <20031017165157.276E22A8D5@canning.wemm.org>
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On Fri, Oct 17, 2003 at 09:51:57AM -0700, Peter Wemm wrote: > > AHA! origpte being 0xd0d0d0d0 means that something really came unstuck > because that is the fill pattern that userland malloc(3) uses. The > 4MB page thing is a red herring, it just happens that PG_PS (0x80) is > a set bit in the fill pattern. > > Now to find the source. :-( Are you getting this repeatably? If somebody > is able to (relatively) easily provoke this, there are a few things I'd > like to try (shotgun diagnostics, but its better than nothing). I also have a dual-athlon system that gets this panic on current. The problem shows up first as sig 10 & 11 on builds (world/kernel/ports) and eventual panic on pmap_enter on 4mb page. I KNOW it's not hardware, because a -current kernel from 9/24/03 is rock-solid (hours of port builds, make -j16 buildworld) and so is RELENG_5_1. The current kernel from yesterday did not even get through installworld without a sig11. I'm pretty sure it's not ata, because my system has scsi disks, and only an idle ata cdrom. I have pentiumpro as my cputype, because I also use this system to build for my laptop - is that a conceivable clue? But for experiments we can set it to anything. It's not in production, so if you want to try stuff, I'm willing to give you a login or take direction. Right now it's running RELENG_5_1 but I also have yesterday's -head on there and a local cvs on another system updated twice a day. -- Barney Wolff http://www.databus.com/bwresume.pdf I'm available by contract or FT, in the NYC metro area or via the 'Net.
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